DaniWeb Forum Index > Software Development > C

clrscr is usually given after declaration of variables. why ?

Please support our C advertiser: Programming Forums - DaniWeb Sister Site

•

Join Date: Jun 2008

Posts: 9

Reputation: rocky2008 is an unknown quantity at this point

Solved Threads: 0

rocky2008

Offline

Newbie Poster

clrscr is usually given after declaration of variables. why ?

May 27th, 2009

clrscr() is usually given after the declaration of all variables. If it is given before the declaration(of variables), the compiler points out an error. Why is this due to ? Will there be any problem in allocating the required amount of memory if at all clrscr() is given before the declaration?

Kindly reply to this question !!

Thanks !!

Regards,
Rocky.

•

Join Date: Oct 2008

Posts: 2,721

Reputation: adatapost has much to be proud of

Solved Threads: 501

adatapost

Offline

Posting Maven

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

Read "C Program Structure" section from your text book. I am sure, you will get the answer.

•

Join Date: Aug 2005

Posts: 15,672

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1502

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

you can't put executable statements before variable declarations in C language.

•

Join Date: Jun 2008

Posts: 9

Reputation: rocky2008 is an unknown quantity at this point

Solved Threads: 0

rocky2008

Offline

Newbie Poster

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

i couldn't find the answer. can u please help me if you know the answer.

•

Originally Posted by adatapost

Read "C Program Structure" section from your text book. I am sure, you will get the answer.

Regards,
Rocky.

•

Join Date: Jun 2008

Posts: 9

Reputation: rocky2008 is an unknown quantity at this point

Solved Threads: 0

rocky2008

Offline

Newbie Poster

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

thanks for your response. but can u please tell me why executable statements cant be given before variable declaration ?

•

Originally Posted by Ancient Dragon

you can't put executable statements before variable declarations in C language.

Regards,
Rocky.

•

Join Date: Aug 2005

Posts: 15,672

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1502

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

If the answer is not in your text book then you need a different book! But I'm sure its in the book, you just need to study the sections about C language program structure.

 Help with Code Tags 
 C Syntax (Toggle Plain Text) 
// includes go here
#include <stdio.h>
...
int main(int argc, char* argv[])
{
    // all variable declarations go here
    //
    // executable statements follow
    //
    {
         // new block, so more variables here
         // followed by executable statements
    } // end of block
} // end of main() function
// includes go here
#include <stdio.h>
...
int main(int argc, char* argv[])
{
    // all variable declarations go here
    //
    // executable statements follow
    //
    {
         // new block, so more variables here
         // followed by executable statements
    } // end of block
} // end of main() function

•

Join Date: Aug 2005

Posts: 15,672

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1502

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

•

Originally Posted by rocky2008

thanks for your response. but can u please tell me why executable statements cant be given before variable declaration ?

Yes -- because the iso standards say so. I have read that this requirement is going to be relaxed in the next revision of the standards, but no compilers have implemented that yet (for obvious reasons)

Last edited by Ancient Dragon; May 27th, 2009 at 8:30 am.

•

Join Date: Jun 2008

Posts: 9

Reputation: rocky2008 is an unknown quantity at this point

Solved Threads: 0

rocky2008

Offline

Newbie Poster

Re: clrscr is usually given after declaration of variables. why ?

May 27th, 2009

oh!! then does this problem arise because of the problem in allocating the required amount of memory by the compiler ?

•

Originally Posted by Ancient Dragon

Yes -- because the iso standards say so. I have read that this requirement is going to be relaxed in the next revision of the standards, but no compilers have implemented that yet (for obvious reasons)

Regards,
Rocky.